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how can I find line index in validate field?

Have a look in the help on the Entry Point: <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4410693152.html>

<@UP0GS40AF> if I want to set a field value in validate field, do I need to select the line and then set the value or  I can use setValue directly?

I believe you can set it using currentRecord.setCurrentSublistValue() as the line is still selected in the validatefield entry point

There are pretty good examples in the help, I suggest you read them.